iliocostal muscle il·i·o·cos·tal muscle (ĭl’ē-ō-kŏs’təl) n. The lateral division of the erector muscle of the spine, having three subdivisions: the lumbar iliocostal muscle, the thoracic iliocostal muscle, and the cervical iliocostal muscle.

iliofemoral ligament n. A triangular ligament attached by its apex to the lower front spine of the ilium and rim of the acetabulum, and by its base to the front intertrochanteric line of the femur. The strong medial band is attached to the lower part of the intertrochanteric line. Also called Y-shaped ligament.

iliohypogastric nerve il·i·o·hy·po·gas·tric nerve (ĭl’ē-ō-hī’pə-gās’trĭk) n. A nerve that arises from the first lumbar nerve and supplies the abdominal muscles and the skin of the lower part of the anterior abdominal wall.

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